Thanks again for all the great information. I've been following that Milsurps forum discussion as well. I disassembled the mechanism today along with comparing function to a rifle I have that functions well. The travel of the carrier arm is limited. It rides lower in the magazine than the one in the good rifle, but no interference. I tried the second spare spring I had with the same result. I even tried prying it out farther but it's a dead stop. What other part could limit the range of motion. The follower pin is flush. I've ordered another carrier/follower from granpa's gun parts but it will be awhile before I get it. I think they are on vacation. Still a mystery.